Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369110
A. Taghavi, C. Carta, F. Ellinger, M. Haferlach, M. Claus, M. Schroter
In this paper we present a Carbon Nano-Tube Field Effect Transistor (CNTFET) amplifier. As the miniaturization trend of electronic devices continues the industry seeks alternative technologies and CNTFETs have the potential to succeed in this emerging trend. To demonstrate the feasibility of using CNTFETs as an active element for RF circuits we have designed, implemented and characterized an amplifier on standard FR-4 substrate with the use of off-the-shelf SMD (Surface Mount Devices) components. In this work, we present the characterization of the employed device and the performance of an amplifier operating at 538 MHz with 5.6 dB of gain and excellent matching of -21 dB.
{"title":"A CNTFET amplifier with 5.6 dB gain operating at 460–590 MHz","authors":"A. Taghavi, C. Carta, F. Ellinger, M. Haferlach, M. Claus, M. Schroter","doi":"10.1109/IMOC.2015.7369110","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369110","url":null,"abstract":"In this paper we present a Carbon Nano-Tube Field Effect Transistor (CNTFET) amplifier. As the miniaturization trend of electronic devices continues the industry seeks alternative technologies and CNTFETs have the potential to succeed in this emerging trend. To demonstrate the feasibility of using CNTFETs as an active element for RF circuits we have designed, implemented and characterized an amplifier on standard FR-4 substrate with the use of off-the-shelf SMD (Surface Mount Devices) components. In this work, we present the characterization of the employed device and the performance of an amplifier operating at 538 MHz with 5.6 dB of gain and excellent matching of -21 dB.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123831801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369077
R. V. Favero, J. S. Marçal, Paulo C. B. Silva, L. H. Bonani, M. Abbade
In this paper, we propose and analyze a new defragmentation strategy for elastic optical networks (EON). Such strategy is based on the cyclical identification of the most fragmented optical link followed by later reallocation of the lighpaths that share it. Our computer simulation results indicate that the considered scheme offers a blocking probability reduction of up to 48% in comparison to the situation where no defragmentation is deployed.
{"title":"A new elastic optical network defragmentation strategy based on the reallocation of lightpaths sharing the most fragmented link","authors":"R. V. Favero, J. S. Marçal, Paulo C. B. Silva, L. H. Bonani, M. Abbade","doi":"10.1109/IMOC.2015.7369077","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369077","url":null,"abstract":"In this paper, we propose and analyze a new defragmentation strategy for elastic optical networks (EON). Such strategy is based on the cyclical identification of the most fragmented optical link followed by later reallocation of the lighpaths that share it. Our computer simulation results indicate that the considered scheme offers a blocking probability reduction of up to 48% in comparison to the situation where no defragmentation is deployed.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124393770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369137
M. P. Cardoso, Anderson O. Silva, J. C. Costa
The implementation of microstructured fibers for guidance of THz waves is one of the current milestones in Electromagnetic Engineering. In this work, we investigate theoretically how to reduce propagation losses of a THz microstructured fiber with metallic inclusions. Obtained results show that losses can be reduced to values below 1.5 dB/cm depending on the configuration of the metallic array on the fiber cross-section. Additionally, a bandwidth of zero group velocity dispersion is also obtained.
{"title":"Low-loss microstructured fiber with metallic inclusions for THz waveguiding","authors":"M. P. Cardoso, Anderson O. Silva, J. C. Costa","doi":"10.1109/IMOC.2015.7369137","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369137","url":null,"abstract":"The implementation of microstructured fibers for guidance of THz waves is one of the current milestones in Electromagnetic Engineering. In this work, we investigate theoretically how to reduce propagation losses of a THz microstructured fiber with metallic inclusions. Obtained results show that losses can be reduced to values below 1.5 dB/cm depending on the configuration of the metallic array on the fiber cross-section. Additionally, a bandwidth of zero group velocity dispersion is also obtained.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125304079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369113
Danilo R. B. Araújo, C. Bastos-Filho, J. Martins-Filho
Recent studies demonstrated the feasibility of surrogate methods to assess optical networks based on Artificial Neural Networks (ANNs). However, surrogate methods present different trade offs between accuracy and resource utilization efficiency, such as computational time. In this paper we analyze the use of ANN to forecast the Blocking Probability (BP) of deployed optical networks considering different architectures for the underlying alternative method. We also analyze the impact of the adopted physical layer model and the number of optical networks needed to train the ANN. We compare the results of our proposal with the outcome of a discrete event network simulator. From our results we can conclude that ANN is a promising technique to estimate the BP of transparent optical networks, but the dataset used to train the ANN and the physical layer model are crucial for the proper design of this type of tool.
{"title":"Analyzing surrogate models to assess Blocking Probability of optical networks","authors":"Danilo R. B. Araújo, C. Bastos-Filho, J. Martins-Filho","doi":"10.1109/IMOC.2015.7369113","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369113","url":null,"abstract":"Recent studies demonstrated the feasibility of surrogate methods to assess optical networks based on Artificial Neural Networks (ANNs). However, surrogate methods present different trade offs between accuracy and resource utilization efficiency, such as computational time. In this paper we analyze the use of ANN to forecast the Blocking Probability (BP) of deployed optical networks considering different architectures for the underlying alternative method. We also analyze the impact of the adopted physical layer model and the number of optical networks needed to train the ANN. We compare the results of our proposal with the outcome of a discrete event network simulator. From our results we can conclude that ANN is a promising technique to estimate the BP of transparent optical networks, but the dataset used to train the ANN and the physical layer model are crucial for the proper design of this type of tool.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125409815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369180
J. F. Kuhne, V. de Oliveira, H. Kalinowski, Ricardo Canute Kamikawachi
Experimental results of refractive index sensitivity of etched fiber Bragg gratings inscribed in multimode fibers are presented in this work. The response of gratings to environmental refractive index changes is investigated by gratings immersion into glycerin-water blends with several concentrations. This study concludes that refractive index sensitivity of etched fiber Bragg gratings inscribed in multimode fibers are higher than the one found at etched fiber Bragg grating inscribed in single-mode fibers. Greater multimode core diameter enables Bragg gratings to exhibit enhanced sensitivity without requiring further fiber diameter reduction.
{"title":"Refractive index sensitivity of fiber Bragg grating inscribed in a multimode fiber","authors":"J. F. Kuhne, V. de Oliveira, H. Kalinowski, Ricardo Canute Kamikawachi","doi":"10.1109/IMOC.2015.7369180","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369180","url":null,"abstract":"Experimental results of refractive index sensitivity of etched fiber Bragg gratings inscribed in multimode fibers are presented in this work. The response of gratings to environmental refractive index changes is investigated by gratings immersion into glycerin-water blends with several concentrations. This study concludes that refractive index sensitivity of etched fiber Bragg gratings inscribed in multimode fibers are higher than the one found at etched fiber Bragg grating inscribed in single-mode fibers. Greater multimode core diameter enables Bragg gratings to exhibit enhanced sensitivity without requiring further fiber diameter reduction.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123982476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369158
Paulo Fernandes da Silva, P. H. da Fonseca Silva, J. Costa e Silva, Alexandre Ferreira dos Santos, Maria do Carmo de Luna M Frazao, A. Serres, R. C. Silverio Freire
The study of printed monopole antennas (PMA) with truncated ground plane has application in various types of technologies. This kind of ground plane, promotes an omnidirectional radiation pattern with broadband response and allows the antenna to suffer influence from nearby conductive material. This article presents the simulated and measured results of influences from a rectangular aluminum tube on a circular PMA that meets the UWB technology requirements. The results obtained indicate that the tube at a wavelength distance of 1/8? reduce the bandwidth by 50% in X-band (8 ~ 12 GHz), half power bandwidth HPBW is approximately 90° and gain of 6.92 dBi.
{"title":"Influence of conductor tube in circular PMA for UWB range","authors":"Paulo Fernandes da Silva, P. H. da Fonseca Silva, J. Costa e Silva, Alexandre Ferreira dos Santos, Maria do Carmo de Luna M Frazao, A. Serres, R. C. Silverio Freire","doi":"10.1109/IMOC.2015.7369158","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369158","url":null,"abstract":"The study of printed monopole antennas (PMA) with truncated ground plane has application in various types of technologies. This kind of ground plane, promotes an omnidirectional radiation pattern with broadband response and allows the antenna to suffer influence from nearby conductive material. This article presents the simulated and measured results of influences from a rectangular aluminum tube on a circular PMA that meets the UWB technology requirements. The results obtained indicate that the tube at a wavelength distance of 1/8? reduce the bandwidth by 50% in X-band (8 ~ 12 GHz), half power bandwidth HPBW is approximately 90° and gain of 6.92 dBi.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127960123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369047
E. Silveira, D. Nascimento, J. C. da S. Lacava
This paper reports the design of probe-fed moderately thick microstrip antenna for dual orthogonal circularly-polarized radiation. The antenna is composed of a rectangular truncated patch and the polarization diversity is achieved by controlling the states of four PIN diodes. The rectangular patch is designed according to the null reactance condition. Simulated radiation pattern, reflection coefficient magnitude and axial ratio are in good agreement with experimental results.
{"title":"Reconfigurable truncated corners microstrip antenna","authors":"E. Silveira, D. Nascimento, J. C. da S. Lacava","doi":"10.1109/IMOC.2015.7369047","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369047","url":null,"abstract":"This paper reports the design of probe-fed moderately thick microstrip antenna for dual orthogonal circularly-polarized radiation. The antenna is composed of a rectangular truncated patch and the polarization diversity is achieved by controlling the states of four PIN diodes. The rectangular patch is designed according to the null reactance condition. Simulated radiation pattern, reflection coefficient magnitude and axial ratio are in good agreement with experimental results.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124982146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369069
R. Figueiredo, T. Sutili, N. Ribeiro, E. Conforti, C. Gallep
Experimental sweep frequency results of electro-optical conversion for a chip-on-carrier and for a packaged semiconductor optical amplifiers are presented up to the fifth harmonic. Influence from electrical bias current, spectral components, and input power are analyzed. The experimental results illustrate the influence of electrical parasitic elements in semiconductor optical amplifiers' bandwidth and could be used for equivalent circuit parameters extraction.
{"title":"Electro-optical conversion analysis of chip-on-carrier and packaged semiconductor optical amplifiers","authors":"R. Figueiredo, T. Sutili, N. Ribeiro, E. Conforti, C. Gallep","doi":"10.1109/IMOC.2015.7369069","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369069","url":null,"abstract":"Experimental sweep frequency results of electro-optical conversion for a chip-on-carrier and for a packaged semiconductor optical amplifiers are presented up to the fifth harmonic. Influence from electrical bias current, spectral components, and input power are analyzed. The experimental results illustrate the influence of electrical parasitic elements in semiconductor optical amplifiers' bandwidth and could be used for equivalent circuit parameters extraction.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128058428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369223
Samuel M. L. da Silva, M. C. Rezende, Alberto J. Orlando Faro, Newton A S Gomes
A cylinder with 2.5m of length and 0.15 m of diameter had its RCS (radar cross section) measurement performed. Subsequently, its RCS was reduced with microwave absorbing material. It was studied what the impact to the RCS of the target after transform the cylinder coated with material into a cylindrical cavity. The absorber material behavior was evaluated under the strain of a cylindrical curvature compared to the initial characterization data held in flat surface. Thus, was obtained about 20 dBsm (side) and 6 dBsm (bases) for the RCS of the cylinder. The material with 18 dB absorption capacity presented 14 dB in the case of cylindrical target, a result considered satisfactory, since this value was limited by the baseline scattering present in the “setup”. It was observed that, even subject to the stresses of curvature, the material showed no plastic deformation or cracking. Finally, it was found that the reduced RCS (360°) of the cylindrical cavity was increased in relation to the reduced RCS of the cylinder.
{"title":"Effects of cavity on RCS of cylinder coated with microwaves absorbing material","authors":"Samuel M. L. da Silva, M. C. Rezende, Alberto J. Orlando Faro, Newton A S Gomes","doi":"10.1109/IMOC.2015.7369223","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369223","url":null,"abstract":"A cylinder with 2.5m of length and 0.15 m of diameter had its RCS (radar cross section) measurement performed. Subsequently, its RCS was reduced with microwave absorbing material. It was studied what the impact to the RCS of the target after transform the cylinder coated with material into a cylindrical cavity. The absorber material behavior was evaluated under the strain of a cylindrical curvature compared to the initial characterization data held in flat surface. Thus, was obtained about 20 dBsm (side) and 6 dBsm (bases) for the RCS of the cylinder. The material with 18 dB absorption capacity presented 14 dB in the case of cylindrical target, a result considered satisfactory, since this value was limited by the baseline scattering present in the “setup”. It was observed that, even subject to the stresses of curvature, the material showed no plastic deformation or cracking. Finally, it was found that the reduced RCS (360°) of the cylindrical cavity was increased in relation to the reduced RCS of the cylinder.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128160936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/IMOC.2015.7369187
R. Oliveira, J. Souza, F. Magno, K. Cozzolino, G. Cavalcante
In this paper the formalism of Parabolic Equations for narrow angles, a statistical method, the Moving Average and a empirical model, the Hata-Davidson, were used for to study on the quality of digital TV signal in the UHF band, and were compared with the measured in an heterogeneous environment, because it has areas with large buildings mixed with Amazonian vegetation. The implicit finite difference scheme of the Crank-Nicolson type was applied in order to get the solution of the Parabolic Equation. The propagation was considered in 15° in the direction paraxial. The results showed that the formalism of Parabolic Equations can be used to study the quality of digital TV signal. The average error was 1.62 dB and standard deviation 4.13 dB.
{"title":"Application of Parabolic Equation and Hata-Davidson propagation models for digital TV coverage prediction","authors":"R. Oliveira, J. Souza, F. Magno, K. Cozzolino, G. Cavalcante","doi":"10.1109/IMOC.2015.7369187","DOIUrl":"https://doi.org/10.1109/IMOC.2015.7369187","url":null,"abstract":"In this paper the formalism of Parabolic Equations for narrow angles, a statistical method, the Moving Average and a empirical model, the Hata-Davidson, were used for to study on the quality of digital TV signal in the UHF band, and were compared with the measured in an heterogeneous environment, because it has areas with large buildings mixed with Amazonian vegetation. The implicit finite difference scheme of the Crank-Nicolson type was applied in order to get the solution of the Parabolic Equation. The propagation was considered in 15° in the direction paraxial. The results showed that the formalism of Parabolic Equations can be used to study the quality of digital TV signal. The average error was 1.62 dB and standard deviation 4.13 dB.","PeriodicalId":431462,"journal":{"name":"2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130161008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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